Overview
ISO 10225:2013 specifies a standardized gas letter code for marking equipment used in gas welding, cutting and allied processes when the full gas name or chemical symbol cannot be used. Published by ISO/TC 44 (Welding and allied processes), this concise standard ensures consistent, unambiguous identification of gases on torches, hoses, fittings and related gas-welding equipment to support safety, compatibility and traceability.
Key Topics and Requirements
- Scope: Applies to marking of gas welding, cutting and allied equipment when full gas names or chemical symbols are impractical.
- Primary requirement: Use the letter codes in Table 1 of ISO 10225:2013 for marking equipment instead of full names.
- Mandatory codes (selected from the standard):
- Oxygen - O
- Air - D
- Nitrogen / inert gases - N
- Carbon dioxide - B
- Acetylene - A
- Hydrogen - H
- MPS - Y
- Natural gas / methane - M
- Propane / butane / LPG - P
- Ethylene - E
- Propylene - L
- Coal gas / town gas - C
- Other combustible gases or mixtures - F
- Special note on code F: If F is used for combustible gases or multi-gas compatibility, the manufacturer must supply instructions that specify the full gas names and detailed compatibility information.
- Traceability and safety: The code system reduces confusion in environments where space on equipment is limited or multilingual markings are required.
Applications
ISO 10225:2013 is practical for:
- Marking torches, torches heads, mixers, hoses, regulators and fittings used in gas welding and cutting.
- Manufacturers and OEMs creating compact labels where full names or chemical symbols won’t fit.
- Safety documentation and labeling programs in workshops, fabrication shops, and industrial plants.
- Procurement and inventory systems to standardize equipment identifiers across suppliers and international operations.
Who should use this standard
- Equipment manufacturers and designers of gas welding/cutting tools
- Safety officers, workshop managers and maintenance teams
- Suppliers, distributors and inspectors handling gas welding equipment
- Standards committees and regulatory bodies coordinating marking and safety guidance
Related Standards
- ISO 10225:2013 was prepared by ISO/TC 44/SC 8 (gas welding equipment). For broader context, consult other ISO welding and gas-handling standards and national regulations covering gas cylinders, fittings and workplace gas safety.
Keywords: ISO 10225:2013, gas welding equipment, marking, gas letter code, gas identification, welding and cutting, acetylene, oxygen, propane, safety labeling.
Open preview (PDF)Gas welding equipment — Marking for equipment used for gas welding, cutting and allied processes
